Currently, there are no Seeker models in production, which makes it impossible to give a technically-correct answer.
Practically speaking, they're Cavalry, so it's pounds to pennies (or dollars to dimes for you I guess) that they'll be supplied with 40mm round bases for 40K, and also with 25 by 50 rectangular bases for Fantasy. So go ahead and mount them up on either of those options.
I'm not 100% on Demon Princes, but I'm near certain that being essentially a very big guy (as opposed to the Greater Demons, which are huge guys), they go onto 40mm bases.
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